Physics 2

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 Author: misbah ID: 220482 Filename: Physics 2 Updated: 2013-05-21 23:45:14 Tags: thermodynamics magnetism electromagnetic current circuits sound Folders: Description: .. Show Answers:

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1. Thermal expansion

• L = original length
• T = temperature
2. Volume expansion for liquids

3. Internal energy of a system

• Work done by the system = positive
• Work done on the system = negative

• Heat flow into the system = positive
• Heat flow out of system = negative
4. Heat of transformation - phase changes
Q = mL

L = heat of transformation of a system
5. Work done on the system

• P = pressure
• constant volume means no work
6. Energy Spontaneity - entropy

Reversible precess:

L = either heat of fusion or vaporization
7. Coulomb's law
• Magnitude of electrostatic force between two charges
8. Electric field - produced by an electric charge

• qo = test charge
• F = force felt by test charge
• units: N/C
9. Electrical potential Energy
10. Electric potential
• volts = J/C
11. Tesla, gauss
Tesla = Ns/mC

gauss = 10-4 tesla
12. Current
• units: C/s = ampere
13. Magnetic field at center of current carrying loop

units: tesla
14. Magnetic Field force

• v= velocity
• θ= angle between qv and B

• Max when θ=90 : qvB
• Zero when θ=0
15. Right hand rule
• thumb - velocity
• fingers - magnetic field
• palm - force
16. Orbit radius of a charge
• set centripatal force equal to magnetic force
• qvB=mv2/2

17. Magnetic field of uniform circular motion
18. velocity of a uniform circular motion
19. Magnetic force on a current carrying wire

• i = current
• L = length
20. Resistance

• units: Ω
• L = length
• A = cross sectional area
21. Ohm's law
Voltage drop
V = iR
22. Power of a resistor
P = iV

V = voltage drop across resistor
23. Power lost during transmission, dissapated by resistor
P = i2R

P = V2/R
24. Voltage drop across resistors in series
• Current through all resistors is equal to current of total resistance.
• Voltage drop across each resistor will be different. - use current to calculate it

• Vs are the voltage drop across each resistor
• VT is the voltage coming out of the battery.
25. Total resistance of resistors in series
26. Voltage drop across resistors in parallel
Voltage drop across each path is the same, but current is split up. More current goes through resistor of least resistance.
27. Total resistance of resistors in parallel
28. capacitance

29. capacitance with two plates

• A = area of overlap
• d = distance between plates
30. Electric field in a capacitor
• direction of field is away from positive plate.
31. Potential energy of a capacitor
32. Dielectrics - change capacitance
C' = kC

• C'= new capacitance
• C=original capacitance
33. Electromotive force ε
voltage across terminals of battery when there is no charge flowing

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